#!/bin/env python
# -*- coding:utf-8 -*-
class Student(object):
	@property
	def score(self):
		return self._score
	@score.setter
	def score(self,value):
		if not isinstance(value,int):
			raise ValueError('score must be an integer!')
		if value < 0 or value > 100:
			raise ValueError('score must between 0 ~ 100!')
		self._score = value
if __name__=='__main__':
	s=Student()
	s.score=60
	print s.score
